SITE INFORMATION AND CORRESPONDENCE

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*MEMO- R A N-D-U M- CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION 3443 Routier Road, Suite A Phone: (916) 255-3000 Sacramento, CA 95827-3098 CALNET: 8-494-3000 TO: Wendy L. Cohen FROM: David E. Jenkins Senior Engineer Associate Engineering Geologist DATE: 29 September 1993 SIGNATURE: ! o✓--�— SU13JECT: SITE STATUS REVIEW, CHEVRON PIPE LINE COMPANY, LYOTH LOADING STATION, TRACY, SAN JOAQUIN COUNTY The former Lyoth Loading Station is a 14-acre site in southeast Tracy (see Figure 1). Standard Oil Company of California (now Chevron) owned this property from 1910 through 1953 and operated a fuel loading facility (Lyoth Loading Station) on this site. The facility received fuel from the company's Richmond refinery for loading onto rail cars and trucks. Facilities at the loading station included a 55,000-gallon and two 35,000-gallon storage tanks, a railroad spur and a cottage (see Figure 2). The current owner, Mr. Paul Hoffman, has a maintenance shop, office and yard on the north half of the parcel and a walnut grove on the south half. In 1990, Mr. Hoffman contacted Chevron because some petroleum-like material had surfaced at two locations on the property. As a result, Chevron contracted with EMCON Associates to perform an environmental assessment on the property. This environmental assessment report was completed 6 March 1991 and submitted to the Board in April 1991. EMCON drilled eight soil borings to characterize subsurface conditions at the site, and completed two of them as ground water monitoring wells (see Figure 2). Ground water was encountered at depths of 16-18 feet below ground surface in each boring. Seventeen soil samples and one ground water sample were collected and analyzed for total petroleum hydrocarbons as diesel (TPH-D) and benzene, toluene, ethylbenzene and xylenes (BTEX). Two soil samples collected from boring B-6 also were analyzed for semi-volatile organic compounds. Soil samples from borings MW-2, B-3, and B-6 contained TPH-D ranging from 330 to 15,900 ppm (see Table 1). None of the soil samples contained benzene or ethylbenzene, while some of the samples containing TPH-D also contained low levels of toluene and xylenes. No semi-volatile organic compounds were detected in the soil samples from boring B-6, and no volatile organic compounds were detected in the TCLP scans performed on the surface sample from B-2 and the sample from 15 feet in MW-2. Well MW-2 contained approximately two inches of floating product, so it was not sampled this first round. The ground water sample from MW-1 was non-detect for TPH-D and BTEX.